Polyarylene sulfide resin compositions

Abstract

A polyarylene sulfide resin composition obtained by melt-mixing a mixture comprising resin components comprising as main resins (A) a polyarylene sulfide resin and (B) a polyorganopsiloxane graft copolymer obtained by graft-polymerizing one or more kinds of vinyl monomer containing at least an epoxy group-containing vinyl monomer onto a compound rubber in which a polyorganosiloxane rubber and a polyalkyl (meth)acrylate rubber have been inseparably united with each other. The composition of the present invention, whether it contains a filler or not, is excellent in compatibility between the polyarylene sulfide resin and polyorganosiloxane graft copolymer. If this composition is extrusion-molded or injection-molded under the common molding conditions, it keeps its original dispersed and mixed condition without showing a phase separation. Consequently, this composition has an excellent performance that impact resistance also has been given to the polyarylene sulfide resin without largely injuring excellent properties inherent to the resin. Particularly, this composition is very little deteriorated in impact strength when it is put in wet heat conditions under pressure, and therefore it is usable in such conditions.

What is claimed is: 
     
       1. A polyarylene sulfide resin composition obtained by melt-mixing a mixture comprising (A) a polyarylene sulfide resin and   (B) a polyorganosiloxane graft copolymer obtained by graft-polymerizing one or more kinds of vinyl monomer containing at least an epoxy group-containing vinyl monomer onto a compound rubber in which a polyorganosiloxane rubber and a polyalkyl (meth) acrylate rubber have been inseparably united with each other, wherein the proportion of said polyorganosiloxane graft copolymer derived from said one or more kinds of vinyl monomer is 5-50 wt. % based on a total weight of said polyorgano-siloxane graft copolymer.   
     
     
       2. A polyarylene sulfide resin composition according to claim 1, wherein said polyarylene sulfide resin is a polyphenylene sulfide resin. 
     
     
       3. A polyarylene sulfide resin composition according to claim 1, wherein said compound rubber is one obtained by polymerizing an alkyl (meth)acrylate, a crosslinking agent for a polyalkyl (meth)acrylate rubber and a graft-linking agent for a polyalkyl (meth)acrylate rubber in the presence of a polyorganosiloxane rubber obtained by emulsion-polymerizing organosiloxane, a crosslinking agent for a polyorganosiloxane rubber and, optionally, a graft-linking agent for a polyorganosiloxane rubber. 
     
     
       4. A polyarylene sulfide resin composition according to claim 1, wherein the proportion of said polyorganosiloxane graft copolymer derived from said epoxy group-containing vinyl monomer is 1 to 40 wt. % based on the total weight of said polyorganosiloxane graft copolymer. 
     
     
       5. A polyarylene sulfide resin composition according to claim 1, wherein said polyorganosiloxane graft copolymer has an average particle size of 0.08 to 0.6 μm. 
     
     
       6. A polyarylene sulfide resin composition according to claim 1, wherein the amount of the polyorganosiloxane graft copolymer is 1-70 parts by weight per 100 parts by weight of the polyarylene sulfide resin. 
     
     
       7. A polyarylene sulfide resin composition according to claim 1 which contains 10 to 300 parts by weight of a filler per 100 parts by weight of the total amount of the resin components comprising as main resins the polyarylene sulfide resin (A) and the polyorganosiloxane graft copolymer (B). 
     
     
       8. A polyarylene sulfide resin composition according to claim 1, wherein the proportion of said polyorganosiloxane graft copolymer derived from said epoxy group-containing vinyl monomer is 5-30 wt. % based on the total weight of said polyorganosiloxane graft copolymer.